Original sentence: The fossa is a quick climber and runner that hunts in trees and on the ground.
Is it correct? Yes — it is grammatically correct.
Here are some simple ways to make it even clearer for a young child:
- Clear with one word change: The fossa is a fast climber and runner that hunts both in trees and on the ground.
- Even simpler (two short sentences): The fossa is a fast climber and runner. It hunts in trees and on the ground.
Why the original sentence is correct (explained simply):
- "The fossa" is the name of the animal (the subject).
- "is" is the action word that goes with the subject and it fits right.
- "quick climber and runner" tells us what the fossa can do (climb and run).
- "that hunts in trees and on the ground" tells us where the fossa looks for food.
Tip: For kids, the word "fast" sounds a little more natural than "quick," but both are correct.
Good job — your sentence is clear and correct!